Benjamin irving



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Letters Patent No. 64,325, dotted .April 30, 1867.

IMPRDVED APPARATUS FOR GGNCENTItATIN EXTRGTS FROM BARK EOR TANNILIG.

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TO ALL WHOM I'I MAY CONCERN:

.Bc it known'that I, BENJAMIN IRVING, of the city, county, and State ofNew York, have invented a certain new and improved Apparatusfor-Concentrating the Extract of, Bark for Tanning Purposes;- and I dohereby declare that the following is a full description of the same. l iv 'Ihe nature of my invention consists in combining a worm or coil ofcylindrical pipe with a steam-chamber in such a manner as to admit ofthe continuous How of the liquid extract through theworm or coilof pipe,and at the same time allow ofthe escape of the vapor-ized water from it,in consequence f therheat in the steamehamber surrounding the worm andacting upon it to concentrate the extract before being discharged fromthe lower end of the coil of pipe'i" u 'Y It will be obvious that bythis arrangement the extract, in passing through the worm, is beingevaporated in vacuo and therefore the degree of heat in the chamber.need never be carried up beyond. the boiling point; A

also, by passing the extract through the worm, but a small portion of itis acted upon at a time, consequently the watery part of the extract isreadily vaporized, and being allowed to escape, the concentratedportionV of it is tit to be drawn on" immediately that it reaches theoutlet of the worm, and thus a continuous operation is effected, incontradistinctioato the common method of concentrating extracts frombarks in vacuum-pans.

But to describemy invention more particularly I will refer to theaccompanying drawings, forming a part ot' this specification, the sameletters of reference, wherever they occur, referring to like parts.

Figure luis a perspective View of the apparatus. 4

Figure 2 is a longitudinal out section of the same through the line wir,fig. 3.

Figure 3 is a transverse cut section of thesalne through the line .'02x2. iig. 2.

Letter A represents the cylindrical chamber adjusted upon a bed orframe, B, and'. having an inductionsteanLpipe, C, in its back end, and awaste or condenseduvatcr pipe, D, in its lower side,l about midwaybetween the ends of the chamber. lIn this chamber are arranged two wormsor coils of cylindrical pipes E, running the entire length of thechamber, and nearly filling its interior. The upper ends F ot' thesepipes extend through the head of the steam-chamber, and have 'attachedto them an induction pipe, G, for the admission of the liquid extract,a-nd on their upper sides an exhaust-vapor pipe, H, for the purposeofcarrying off the vaporized watery' parts of the extract as it isbeing concentrated in passing through the'wiorm. Letters I are theoutlets of the worm, to which is attached a-n exhaust pipe J, for thepurpose of carrying the concentrated extract-to any i suitable receiver.For the purpose of causing the extract to flow rapidly through theworin, a force-pump or vacuum-ehamber will be used in connection withthe apparatus, and also a steam-epndensing vessel in connection with thesteam pipe H, so as to take oli' the watery vapor as fast as liberatedfrom the extract.= By this means it will be obvious that the extract, bythe time it reaches the end of the worm or its outlet, will be readilyconcentrated, and the operation be carried orf continuously with all theadvantages of the common vacuum-pan used for such purposes, and at thesame time much more rapidly, as there would be no lost time inalternately charging, heating up, Cooling down, and emptying theapparatus, as is the case with the ordinary vacuum-pan operation. i Y iHaving now described my invention, I will proceed to set forrh what Iclaim, and desire to secure by Letters Patent 0f the United States: v

I claim the combination of the worm or coils of Cylindrical pipes, madeas hereinbefore described, with the steam-chambeffor the purpose ofconcentrating extracts from barks for tanning purposes.

BENJAMIN IRVIN G.

Witnesses:

C. L. BARRITT, J. H. MUNsoN.

